This study was done to provide a population-based report on the epidemiology of orbital lymphomas and measure the trends in the incidence of orbital lymphoma cancer in South Korea.

630 patients with orbital lymphoma in the orbital soft tissue were included in this study. The age-standardised incidence rates increased from 0.03 to 0.08 per 100 000 individuals between 1999 and 2016, with an annual percent change of 6.61%. The most common histopathological type of orbital lymphoma was extra marginal zone B cell lymphoma, accounting for 82.2% of all orbital lymphomas during 1999–2016, followed by diffuse large B cell lymphoma (9.2%). Five-year, 10-year and 15-year OS of orbital lymphoma was 90.8%, 83.8% and 75.8%, respectively. OS showed a significant decrease as age increased and no significant differences between men and women.

The study concluded that the incidence rate of orbital lymphoma is very low in the people of South Korea. However, the incidence rate has increased over the past years. Orbital lymphomas have a worse prognosis as age increases.